Continuous current amplifier



Jma 7, 19,32. E. AS CH 1,862,394

CONTINUOUS QURRENT AMPLIFIER Filed Jan. 3. 1930 Invenfar:

i ikc Patented June 7, 1932 Em ASCH,,OF SUDENDE, NEAR BERLIN,

GERMANY, ASSIGNOR TO. RADIO PATENTS CORPORATION, OF NEW YORK, N Y., A CORPORATION OF NEW YORK CONTINUOUS CURRENT AMPLIFIER Application filed'lanuary 3, 1980,.Seria1 No. 418,311, and in Germany January 8, 1929.

between the anodes and the positive pole ofthe source of high tension current that the efiective cathode drop is only a small fraction of the available drop. 4 In that specification I have also describedthe combination of the anode of one stage with the grid of the next stage in one electrode and also the use of such an electrode as a carrier for the cathode which is insulated therefrom.

If the continuous current amplifier described in the specification referred'to is op erated 'from an alternating current supply and if'it is desired to keep the consumption as low as possible, the source of current for the anodes may be separated from the sources of current heating the filaments.

In the accompanying drawing E is a continuous current voltage which may for instance beobtained by the rectification of an alternating current voltage and from which only the emission currentof the last tube need be derived, since the emission of the preliminar tubes is practically nil. The heating 0 separate batteries, or as shown in the drawing, by means of alternating current. In the drawing the last tube isheated' directly and the preliminary tube indirectly by means of alternating current. The necessary drop between the cathodes may he produced by a resistance inserted between the cathodes and 3 over which flows the emission of thesubsequent tubes.

In the drawing :0 is the input of a twostage amplifier, a the output, Z and Z are exactly to regulate the. grid bias of the second the tubes: may be effected by tube, the resistance r may be'made wholly or partly adjustable. v

Of course the amplifier when usedonlyfor relay or measuring purposes may be fed by an alternating current source instead of a continuous current. The amplifier also may be increased beyond two stages and the assemblingof the electrodes in the manner describedin specification No..314,768 may also beadopted in the present invention.

What I claim is I 1. In a direct coupled electron tube cascade system comprising at least'a first discharge tube, 'a-second discharge tube, said tubes having filament, anode and control electrodes, a direct coupling, connection from said first tube to the control electrode of said second tube,'a source of operating current, said tubes being connected across said source in parallel, series resistors in the supply leads of said tubes for producing proper biasing potential of said second tube and.

means for maintaining the filament potential independent of the filament heating current.

2. An electron tube cascade system as described inclaim 1, in which tubes with indirectly heated cathodes are provided.

3. An electron tube cascade system as described in claim 1, which uses tubes with direct heated filaments with a separate heating transformer for each filament. I

4. In adirect coupled electron tube cascade system'comprising at least a first therinionic tube, a second thermionic tube, said tubes having filament, grid and plate electrodes, a direct coupling connection from the plate of saidv first tube to the grid of said second tube, a source of operating voltage for said tubes, each of said tubes being supplied 'from said source in parallel, and means for maintaining the potential of the filaments of the tubes independent of the filament heating current.

5. A vacuum tube cascade system as described in claim 4 in which tubes with indirectly heated cathodes are provided.

6. A cascade system as described in claim. 4, which uses tubes with direct heated filaments with a separate heating transformer for eachfilament.

7 Q In a direct coupled electron tube cascade system comprising a first discharge tube; a second discharge tube, said tubes having cathode, anode and control electrodes; a di- 7 rect coupling connection from said first tube to the control electrode of said second tube; a source of operating current; an impedance connected in the anode circuit of said first tube; an impedanceconnected in the cathode circuit of said second tube; circuit connections including said impedances for connecting said tubes in parallel across said source of operating current; and means for indirectly heating the cathode of said first tube.

8. In a direct coupled electron tube cascade system comprising a .first discharge tube; a

second discharge tube, said tubes having cathode, anode and control electrodes; a direct coupling connection from said first tube to the control electrode of said second tube; a source of operating current; a resistance connected in the anode circuit of said first tube, a resistance connected in the cathode circuit of said second tube; circuit connections including said resistances for connectin said tubes in parallel across said source 0 operating current; and means for indirectly heating the cathode of said first tube.

In-testimony whereof I aflix my signature.

DR. ING. ERICH ASCH. 

